Glass mosaic



March 4 1924.

1,485,753 E. ZUNDEL GLASS MOSAIC Filed April 9, 1923 z k W- RQWW "a"? W WITNESSES INVENTOR I "Z J By [/YFL ZM/YE/(Z E9 V [44/144 7/ ATTORNEYS Patented a 24 eans N @FFHQP? m, or You, N. Y.

To all whom it may concern Be it known that T, E ZUNDEL, a cit1- zen of the United States, and a resident of the city of New York, borough of Queens, 5 in the county of Queens and State of New York, have invented a new and Improved,

Glass Mosaic, of which -the following is a full, clear, and exact description.

This invention relates to a glass mosaic and a back facin therefor.

An object of. t e invention is to produce a; lass mosaic with aback facing which wifi enable it to be seated on a cementitiolis base and not become gradually loosened as 5 has generally been the case.

It has been found that in preparing thin glass mosaics, especially in the form of rather sizable plates and in very small pieces of mosaic, that the smooth rear surface of lo the glass did not tend to increase its liability to remain firmly fixed to the concrete or cementitious base against which it was placed, consequently, in due course oftime the glass mosaic, and especially the larger sizes, would drop out and e broken.

In order to overcome this defective feature, I have provided a composition which can be very easily prepared and applied to the rear surface of the mosaic and burned 1 therein at the same time that the front surface colors are burned in., This composition when so burned forms a rough back face on the mosaic which causes it more intimately to unite with the cementitious foundation and prevent the liability for the mosaic to drop out of place. Tn eneral the process comprises mixing severa ingredients together to form a powder, painting the back surface of the mosaic with some adhesive material such as varnish or shellac, and then dusting this powder on to the back surface. The mosaic can then be put in a kiln and the front and rear'surface coatings burned in at the same time, thus enabling the usual colors and designs Application and Apr-119, 192a aerial no. some to be burned on to the front surface at the same time that the back facing is burned in.

As a preferred form of composition, I wish to refer to the use of sand, glass, flux and whiting. Preferably, I use the ingredicuts in the following proportions: one pound eachof sand, lass and flux and one ounce of whiting. hese ingredients are mixed, the glass bein either powdered glass or crystal'glass, wh1ch can be broken up. The composition is in the form of a dry powder which can be stored in containers. When it is desired to treat the mosaic, the back surface is treated with varnish, shel-' lac or other binder material and the powder to dusted thereon. It is then put in the furnace and the coating burned in.

One form of my invention is illustrated in the drawings, of which- I Figure 1 is a perspective of a thin glass mosaic with a rough rear facing applied thereto; and

Figure 2 is a section taken through the mosaic.

The mosaic is represented by the numeral 1, and the rough back by the numeral 2.

This invention, therefore, concerns the provision of a glass mosaic having a roughened back surface to eflect a more efficient union with the concrete or cement against which it is placed, and to provide a simple and efiicient composition which can be used for the back facing and be burned on to the surface of the mosaic.

What I claim is:

1. A glass mosaic having a roughened rear surface formed by burning thereinto a composition of glass, sand, flux and whiting.

2. A glass mosaic which has a roughened rear, surface formed by burning thereinto a composition of matter made in the following proportions: one pound of sand, one pound of flux, one pound of glass, and one ounceof whiting.

ZUNDEL. 

